<template>
    <div>
      <!-- <router-link
        tag="div"
        to="/"
        class="header-abs"
        v-show="showAbs">
      </router-link> -->
        <router-link to="/" custom v-slot="{ navigate }" v-show="showAbs">
            <div @click="navigate" class="header-abs" role="link">
                <div class="iconfont header-abs-back">&#xe624;</div>
            </div>
        </router-link>
      <div
        class="header-fixed"
        v-show="!showAbs"
        :style="opacityStyle"
      >
        <router-link to="/">
          <div class="iconfont header-fixed-back">&#xe624;</div>
        </router-link>
        景点详情
      </div>
    </div>
  </template>
  
  <script>
  export default {
    name: 'DetailHeader',
    data () {
      return {
        showAbs: true,
        opacityStyle: {
          opacity: 0
        }
      }
    },
    methods: {
      handleScroll () {
        const top = document.documentElement.scrollTop || document.body.scrollTop || window.pageYOffset
        if (top > 60) {
          let opacity = top / 140
          opacity = opacity > 1 ? 1 : opacity
          this.opacityStyle = { opacity }
          this.showAbs = false
        } else {
          this.showAbs = true
        }
      }
    },
    mounted () {
      window.addEventListener('scroll', this.handleScroll)
    },
    destroyed () {
        console.log("destroyed")
      window.removeEventListener('scroll', this.handleScroll)
    }
  }
  </script>
  
  <style lang="less" scoped>
     @import "~@/assets/styles/varibles.less";
    .header-abs{
      position: absolute;
      left: .2rem;
      top: .2rem;
      width: .8rem;
      height: .8rem;
      line-height: .8rem;
      border-radius: .4rem;
      text-align: center;
      background: rgba(0, 0, 0, .8);
    }
      .header-abs-back{
        color: #fff;
        font-size: .4rem;
      }
    .header-fixed{
      z-index: 2;
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      height: @headerHeight;
      line-height: @headerHeight;
      text-align: center;
      color: #fff;
      background: @bc;
      font-size: .32rem;
    }
      .header-fixed-back{
        position: absolute;
        top: 0;
        left: 0;
        width: .64rem;
        text-align: center;
        font-size: .4rem;
        color: #fff;
    }
  </style>
  